After nuclear fuel goes through a reactor once, it is called spent fuel. Visually, spent fuel looks the same as the fuel that goes into the reactor as it is contained in fuel assemblies containing ceramic fuel pellets. Spent fuel can be stored underwater in spent fuel pools near power plants or be buried deep underground. These pools act both as a shield and a coolant for the fuel. When stored underground, surveying must be done to ensure that the area is geologically stable so that the waste is not disturbed. The nuclear storage container seen here would be part of the waste that is buried deep underground. This orange casing would usually then be covered in clay and a thick layer of concrete.
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